KatO79- Great results, girl! Congrats.
I hope your DH's next SA goes well. I'm hoping that they do your HSG and realize there was just some debris in your tubes that they can immediately flush out pre-IUI and you conceive immediately. I know that's happened to a couple girls on the LTTTC boards. Once their tubes were clear they went back to natural TTC and both conceived within a few months. I'll be keeping my FX'd for you!
Want1Too- I did two rounds of IUI, both with a combination of Clomid and Femara, hCG trigger, and both with multiple follicles. We were told early on that IUI would only have a 10-20% chance of success per cycle, so we switched to IVF after two rounds due to how pricey it was getting them done. (Two rounds of IUI in the US was the same cost as a round of IVF overseas.)
I never got a BFP with IUI, but I do think I had one momentarily implant once as I very much felt pregnant for two day. (With all my pregnancies I have started getting nauseous on 10"dpo" but not been able to get a positive on an HPT until several days later, even with positive betas.) I wasn't on progesterone for my IUI's so I didn't have that support either. I wish I'd had it, as they've found out now my hCG is always low at first and needs extra time to build up to stop AF, requiring a high dose of progesterone no matter what.
Anyway! Since they think I have an immunological issue at this point, I very well could have conceived, but the embryo may have been too damaged to implant correctly. Glad that January's FET will be one with Prednisone. (I'll probably also add in a pregnancy safe antihistamine, as those also reduce the chance of immunological miscarriage in lab studies.)
I honestly prefer IVF over IUI. It's a higher cost and much more intense, but it comes with a much, much, much higher chance of conception. Also, once we switched to IVF and I was able to get pregnant, we could then move on to figuring out what's causing my losses. (I had also lost a natural pregnancy with a boyfriend back in 2008.) Out of 5 IVF transfers, I've gotten 3 BFP's, so it's just a matter of figuring out how to make one stick (and not in my tubes).